According to CBS Sports, Irving took "quite a while to get up" and was eventually helped back to the locker room.
Irving, who had 11 points, six assists and four steals in the game, tweeted afterwards that he's "all good."
Irving has been starting at point guard over Derrick Rose, but K.C. Johnson of the Chicago Tribune reports that before the World Cup began, USA coach Mike Krzyzewski said he'd have "no hesitation" starting Rose.
The U.S. win over Ukraine gives them a 5-0 record in Group C play.
Video of the fall courtesy of Big Cat of BarstoolSports.com:
- Molly Geary